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Note:
If the TX delay of your TNC is not long enough, connection errors
1
may occur. If connection errors frequently occur, it is recommended
to set the TX delay parameter on the TNC to 300 ms by using your
2
computer.
Using a modulator input level that is far different from the optimum
3
40 mV
or 2 V
specifications may result in deterioration of the S/N
P-P
P-P
ratio or signal distortion. This could result in increased errors or a
4
complete failure to connect with other stations.
If the modulator input level exceeds approximately 3 V
5
circuit functions to maintain the same transmit bandwidth as that of
3 V
.
6
P-P
Packet operation, easily affected by transmit and receive conditions,
requires a full-scale S-meter reading for reliable communication.
7
When the S-meter reads less than maximum during 9600 bps
operation, communication errors are frequent.
8
Inputting 9600 bps GMSK signals at too high a level or inputting
significantly distorted signals into the transceiver can cause errors
9
and a wide transmit bandwidth that may interfere with other stations.
10
DATA Connector Pin Functions
11
This section describes each pin of the DATA connector
12
equipped on this transceiver.
13
14
15
16
17
18
19
20
21
80
DATA connector
E (GND)
Pin
No.
1
2
3
the limiter
P-P
4
5
6
Note:
If your TNC has a common pin for 1200 bps and 9600 bps data input,
connect this pin to the DATA connector PR9 pin. Shorting the PR9
and PR1 pins will cause the TNC to malfunction.
When DC voltage is input to the PR1 pin, the TNC may not function.
If this problem happens, add a 10 F capacitor between the PR1 pin
and the TNC. Be careful about the polarity of the capacitor.
Pin
Function
Name
Packet data input
PKD
•
TX data from TNC to transceiver
DE
Ground for PKD
Packet standby
PKS
•
TNC can use this pin to inhibit the
transceiver microphone input while
transmitting packet signals.
PR9
Output of detected 9600 bps data
(500 mV
, 10 k )
P-P
Also functions as a common pin for
•
1200 bps and 9600 bps data output.
Output of detected 1200 bps data
PR1
(500 mV
, 10 k )
P-P
Squelch control output
SQC
•
Inhibits TNC data transmitting while
transceiver squelch is open.
•
Prevents interference to voice
communications on the same
frequency. Also prevents retries.
•
Output Level
Open squelch: +5 V (High)
Closed squelch: 0 V (Low)
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